Piston.



PATENTED AUGz l, 1908.

Ef GOHEN.

mfom. APELGATION FILED FEB. 24, 1908.

@wwwa/olmo evi EPHIE COHEN, OF JOPLIN, MISSOURI.

ris'ron.

Specification of Letters Patent.

Patented Aug-.'11, 1908.

Application filed February 24, 1908. u Serial No. 417,482.

To all whom it may concern:

Be it known that I, EPHIE COHEN, a citizen of the United States, anda resident of Joplin, in the county of Jasper and State of Missouri, have invented certain new and useful Improvements in Pistons, of which the following is a specification.

My invention is an improvement in pistons and particularly in the means for tightening up t epacking thereof from time to time whenever desired Without removing the piston from the cylinder and without opening the cylinder; and the invention consists in certain -iiovel constructions and combinations of parts' as will be hereinafter described and claimed. y

In the drawing Figure 1 is a longitudinal 'section of a cylinder and piston embodying -my invention. Fig. 2 is a cross-section thereof, and Fig. 3 is a detail perspective view of the abutment.

The cylinder A has its headB rovided with a threaded opening B in Whic screws the threaded shank C ofthe abutment C which abutment is shown provided with a' I `cup shaped'body C2 Whose annular surface Cs j may be forced up the tapered or inclined vsurface F2, and the jam nut E 4for securing lias'abody H recessed in one epd at H -derl F in certain plo forms yan abutment for the shiftingdevices of the piston presently described. These shifting devices are'sliown as pins D and the annular constructionfat C3 of the abutmentis preferredbecause it insures the engagement therewith by the pinsD Without regard to the position of thepiston should' the latter turn slightly within the cylinder. Moreover, the cup shape of the body C2 receives the nuts E and E on the piston rod F when the piston is moved Yinto engagement with the abutment C in the operation of the invention. i

The iston rod F is shouldered .at F' and has at 2 a tapered surface receiving the end plate G of the piston and-is also threaded at a to receive the nut E by vwhich the plate G thenut E when'properly seated. The Ipiston to receive a spring I` and also to receive the shoultheend plate` G, is provided alsowith'thfe cir' ,cmferential surface Ha to receive thepacking and spring devices and the saidl body H is also provided with the threaded sockets H? in 'which .are'screwed the pins D which pins project through the openings Gf in the plate G vand pro trude beyond lthe said plate for engage-` s itions'of the parts 'and 4 e end flange H2 oppositement with the abutment C, as will beuiiderstood from the drawings.

The packing I which may be of canvas is .placed on the piston body and bearing or sup orting plates J. are arranged within the pac ing str1 s I and receive the pressure of the springs which springs are secured between their ends to the piston body and bear at their ends against t e inner sides of the plates J being reierably seated in recesses J in the plates in such manner as to prevent any shifting rotaril of the plates J re ativ'ely to the body H. vided at their ends with outwardly turned flanges J2, which flanges J2 project at lthe ends of the paking strips I' and revent any shifting of saidstrips in rotary irection. "I prefer in practice to divide the packing devices into sections by means of an'interniehe plates J are also prodiate partitionL, las best shown iii Fig. 1Y of ravving. Q Y In the operation of the invention when the plates G and II? bear tightly on' the opposite sides of the packingstrips and the latter become worn they will "be held by the end plates G and H2 from adjusting outwardly to secure the fit, Within the cylinder andin such case it ordinaril becomes necessary to open the cylinder andT remove the piston in order sides of the'packingl by such means. fore in order to free the parts and permit' the springs K to act. expansively to spread the packing in the cylinder Whenever-desired, IV provide means Within the cylinder {herebyto relieve the. tension of the spring I and springs Kmay operate as desired.

In the use of the invention when the piston,l is operating properly the abutment C maybe adjusted tower the' end ofthecylinder B itis desired to free the istor from the action spread the plates G `and H2 apart so theV loo ofthespring the a utment mayjoe ad- I .justedto set its surface Ctoward iston and to the position in which the Vpl will vengage the abutmentC at vthe end of the piston. In so doing thepins D L ushed .back carrying with thoern thel i stroke of the will be .body I of the piston againsttlieteiision of the spring I, thisspreadingv of the plates G and H2 apart,` freeing the packing and the .los

'S5 to relieve the pressure and erim't the springs y my invention, pilates G and H2,- are` and attr to operate to force the packing out to 1 packing actuating springs and permitting the a 'tight fit within the cylinder as desired.

e construction is simple, easily operated 'ermits theadjustment of the piston 'packinguwithout opening the cylinder.

Y lt W be understood that in practice the invention is especially designed for use at the water end of a steam operated pump; but may be usedin other locations vwhere pistons are utilized.

1. The combinationl substantially as described of a cylinder-having its head provided with a threaded opening, an abutment havinga stem screwed 1n said opening and a cup shaped body portion having an annular surface for engagement by the shifting devices, a piston rod having a threaded end and nuts thereon and also having a shoulder forming a bearing 'for a spring, a spring bearing at one end agam'st said shoulder, a pistonl having a body provided with a recess receiving said spring and having 'at the end adi pins projecting from the piston jacent to said recess an end plate or flange, a plate opposite said endplate and provlded, with openings for the shifting ody through said openings and protruding beyond said end `plate for engagement with the abutment,

' packing on the piston body, and spring devices for forcing said packing outwardly, all

' substantially as set forth.

' the same, and plates on the o 2.' The combination of a cylinder, a piston having packing, and springs for actuating posite sides of the packing and springs an movable relatively apart, and means within the cylinder whereby said plates may be shifted apart to permit the packing springs .to operate upon the packing, ssantially as set forth.

3. The combination of a cylinder, a piston having packing and springs for actuating the same, and (plates on o posite sides of the packing an springs an movable relatively apart, and means Within the cylinder Whereby said pliates may be shifted apart to permit substantially as set forth.

the pac ngsprings to operate upon the acking, said means having a device projecting outside of. the cylinder. whereby it may be operated from without the cylinder and without the opening of the cylinder,

4. The combination of a ton thereon and having pates or sections movable apart, a spring operating to actuate "said sections toward each other,

and shifting 'ceases ins, shiftingl i forth.

iston rod, a pisdevices o' erating in opposition .to said spring to sprea the sections, and spring actuated paclilling 'on the piston, substantially as set tort v5. The combination of a iston rod having a shoulder, a piston body fitting on the rod 4and having a recess adjacent to said shoulder,

from the piston body through saldA an .abutmentfor engagement by other,;pinfs projecting from the body through the en plate, an abutment adjustably supported on the cylinder, and spring actuated packing on the piston body, substantially as set forth. y

7. The combination of a c linder, a piston having spring actuated pac ing and plates at the ends thereof andmovable relatively toward and from each other, shifting vdevices Awhereby said parts may be moved apart, a

spring pressing said parts normally toward each other, supported in the cylinder for` enga ement by the shifting .devices,' sbstantia y; as set forth.

8. A piston` having a spring-actuated packing,` and platesv at the opposite ends thereof and movable relativelytoward each other and apart, aspring'for' pressin the said plates toward each other and shifting devices whereby the plates may beforced,

aparpto permit the spreading of the packing between thesaid plates, substantially as set 9. They combination of the cylinder, a piston therein and having spring :actuated packing, plates on opposite sldes thereof and movab e relatively apartv and a shifting device operated from Without the cylinder whereby to spread the plates on opposite idesl' of the packing, substantially as se't ort . Ernia' COHEN. Witnesses SoLoN C. KEMON, PERRY B. TURPIN.

and an abutment adjustablyI 

